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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Fusion Science and Technology
February 2025
Latest News
Colin Judge: Testing structural materials in Idaho’s newest hot cell facility
Idaho National Laboratory’s newest facility—the Sample Preparation Laboratory (SPL)—sits across the road from the Hot Fuel Examination Facility (HFEF), which started operating in 1975. SPL will host the first new hot cells at INL’s Materials and Fuels Complex (MFC) in 50 years, giving INL researchers and partners new flexibility to test the structural properties of irradiated materials fresh from the Advanced Test Reactor (ATR) or from a partner’s facility.
Materials meant to withstand extreme conditions in fission or fusion power plants must be tested under similar conditions and pushed past their breaking points so performance and limitations can be understood and improved. Once irradiated, materials samples can be cut down to size in SPL and packaged for testing in other facilities at INL or other national laboratories, commercial labs, or universities. But they can also be subjected to extreme thermal or corrosive conditions and mechanical testing right in SPL, explains Colin Judge, who, as INL’s division director for nuclear materials performance, oversees SPL and other facilities at the MFC.
SPL won’t go “hot” until January 2026, but Judge spoke with NN staff writer Susan Gallier about its capabilities as his team was moving instruments into the new facility.
M. Ogawa et al. (19P20)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 268-270
Technical Paper | Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST07-A1371
Articles are hosted by Taylor and Francis Online.
In the Tohoku University Heliac, transition to the improved mode has been observed when the plasma is biased with a hot cathode inserted into the plasma. Ion temperature measurement using high-resolution spectroscopy demonstrated that when the plasma was biased and transited to the improved mode, the ion temperature increased or was kept almost constant, and the ion density also increased. The total stored energy (the products of temperature and density, neTe, niTi) increased in the improved mode. In neoclassical theory, nonlinearity in ion viscosity plays a key role in the transition. The ion viscosity estimated from the measured ion temperature was consistent with the predictions of the neoclassical theory.
